Added timer, still wip

sim/tb/tb_top_generic.v

@@ -0,0 +1,45 @@
+`timescale 1ns/1ps
+
+module tb_top_generic();
+    reg aclk;
+    reg aresetn;
+
+    wire led_green;
+    wire led_red;
+    wire [5:0] r2r;
+    wire [7:0] LED;
+
+    // 100 MHz board input clock
+    initial aclk = 1'b0;
+    always #5 aclk = ~aclk;
+
+    // Hold reset low, then release
+    initial begin
+        aresetn = 1'b0;
+        #200;
+        aresetn = 1'b1;
+    end
+
+    top_generic #(
+        .sim(1)
+    ) dut (
+        .aclk(aclk),
+        .aresetn(aresetn),
+        .led_green(led_green),
+        .led_red(led_red),
+        .r2r(r2r),
+        .LED(LED)
+    );
+
+    // Ensure firmware path resolves from repository root when simulating.
+    defparam dut.mcu.memfile = "sw/sweep/sweep.hex";
+
+    initial begin
+        $dumpfile("out.vcd");
+        $dumpvars(0, tb_top_generic);
+
+        // Let firmware run for a while.
+        #5_000_000;
+        $finish;
+    end
+endmodule